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CMK's E-spec products meet
the original environmental standards established by CMK. CMK thus contributes
to the reduction of environmental load through the supply of ech-products. |
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The E-spec
standards consist of E-spec requirements and selection standards, In
compliance with customer wishes,products meeting requirements may display
the E-spec marks. |
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| 1.Halogen-free
products |
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Because the PWBs we produce must
be flame-resistant, they contain halogenated substances (brominated
flame retardants). There is some concern that these flame retardants
may release dioxins when the PWBs are incinerated. We chan prevent
the release of dioxins by switching to halogenn-free base materials
that use non-halogan-derived flame retardants. Note that we do not
use brominated flame retardants such as PBB or PBDE, which are banned
under the RoHS Directive; our products have always been free of these
substances. |
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JPCA Halogen-free Standards
| Chlorine content |
0.09wt% or less
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| Bromine content |
0.09wt% or less
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| Combined chlorine and bromine content |
0.15wt% or less
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Halogen content of halogen-free products
| FR-1 Grade |
0.15wt% or less |
| CEM-3 Grade |
0.15wt% or less |
| RF-4 Grade |
0.15wt% or less |
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using base materials that meet the JPCA halogen-free standards, we reduced
the halogen content of our products to 1/60 (compared to previous products). |
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2.Lead-free
products |
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PWBs with surface finishing incorporating
lead solder (from a solder leveler) are subject to the RoHS Directive.
If PWBs containing lead are disposed of inappropriately and subjected
to acid rain , the lead can leach out and pollute the soil or groundwater.
As a superior alternative, CMK recommends switching to surface finishing
with water-soluble preflux. |
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PWB Heat Resistance in Products with Lead-Free Packaging*
(Reflow Heat
Resistance)
Name
Grade |
Peak temperature |
Reflow temperature
/ Reflow time |
Reflow cycles |
CEM-3 |
250°C |
230°C or higher/50±5 seconds |
2 |
FR-4 |
260°C |
230°C or higher/60±5 seconds |
2 |
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*Assessed
in accordance with CMK heat resistance standards
Figres assume CMK standard test patterns, thickness of 1.6t, drying conditions,
and hot air reflow chamber conditions. |
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Lead-free surface finishing
Surface
finishing |
Wettability |
Thermal
resistance |
Smoothness |
Environmental
load |
Cost |
Storage
limit |
| Heat-resistant preflus |
water soluble |
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3 months |
Resin |
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3 months |
| Gold plating |
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6 months |
Lead-free solder leveler
(Sn-3Ag-0.5Cu) |
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6 months |
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Relative comparison
based on internal data and market surveys |
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